scholarly journals High Efficiency Synthesis of the Tetrasccharide Repeating Unit in Azospirillum brasilense Strains Sp246 Based on Silica Gel Supported Perchloric Acid (HClO4-SiO2)

2020 ◽  
Vol 40 (6) ◽  
pp. 1716
Author(s):  
Zili Chen ◽  
Peixia Li ◽  
Weitong Liu ◽  
Zhe Zhuang ◽  
Yuanyuan Wu ◽  
...  
Keyword(s):  
Silica Gel ◽  
Perchloric Acid ◽  
Azospirillum Brasilense ◽  
High Efficiency

scholarly journals Resistance to Growth of Molds for Wood Modified with Hydrophobic Hybrid Silica Gel Containing Copper Amine Complexes

Materials ◽  
2021 ◽  
Vol 14 (3) ◽  
pp. 577
Author(s):  
Shaokun Hao ◽  
Chuanshuang Hu ◽  
Xiuyi Lin ◽  
Jin Gu ◽  
Hong Yun ◽  
...  
Keyword(s):  
Silica Gel ◽  
High Efficiency ◽  
Copper Chloride ◽  
Sol Gel ◽  
Untreated Wood ◽  
Populus Tomentosa ◽  
Amine Complexes ◽  
Hybrid Silica ◽  
Sol Gel Process ◽  
Copper Amine

Complexation copper with amine provides an effective strategy for fixation copper in wood, while hydrophobic modification improves the dimensional stability of wood. Thus, a combination of complexation and hydrophobization is expected to enhance the efficiency of copper-based biocides. In this study, hydrophobic hybrid silica gel containing copper amine complexes (MACu) was prepared through an in situ sol-gel process in wood using methyltriethoxysilane (MTES), 3-amino-propyltriethoxysilane (APTES), and copper chloride. The resistance to growth of molds for MACu modified wood (Populus tomentosa) was measured according to ASTM D3273-16. A leaching resistance test was carried out in accordance with AWPA E11-16. The results showed that only Aspergillus niger covered the surface of untreated wood blocks and no mold grew on the MACu surface even after the leaching test. MACu xerogel and MACu wood were further characterized by SEM-EDS, FTIR, and XPS. A possible schematic diagram of the reaction mechanism was proposed to explain the high-efficiency anti-mold performance of MACu wood.

Perchloric Acid Adsorbed on Silica Gel: An Efficient Heterogeneous Reusable Catalyst for Synthesis of 1,5-Benzodiazepines.

ChemInform ◽  
2006 ◽  
Vol 37 (6) ◽  
Author(s):  
Biswanath Das ◽  
Majjigapu Ravinder Reddy ◽  
Ravirala Ramu ◽  
Kongara Ravinder Reddy ◽  
Madamanchi Geethangili
Keyword(s):  
Silica Gel ◽  
Perchloric Acid ◽  
Reusable Catalyst

Comparison of Different Heterogeneous Catalysts for the Estolides Synthesis from Oleic Acid

2011 ◽  
Vol 364 ◽  
pp. 288-292 ◽  
Author(s):  
Nor Asikin Mohamad Nordin ◽  
Nadia Farhana Adnan ◽  
Noraini Hamzah ◽  
Wan Nor Roslam Wan Isahak ◽  
Alifee Ayatillah ◽  
...  
Keyword(s):  
Oleic Acid ◽  
Silica Gel ◽  
Perchloric Acid ◽  
Heterogeneous Catalysts ◽  
Addition Reaction ◽  
Xps Analysis ◽  
Reaction Products ◽  
Final Conversion ◽  
Direct Addition ◽  
Chromatographic Peaks

Different catalysts, namely various loading of perchloric acid on various supports; HClO4/silica (SiO2), HClO4/silica gel (SG) and HClO4/alumina (Al2O3) were tested for the direct addition reaction of oleic acid (OA) to form estolide compounds. The reactions were carried out under vacuum (2 mBar) for 10 hours at 70 °C under solvent-less conditions. LC-MS ToF of reaction products results showed chromatographic peaks for the presence of two new estolide compounds, oleic-oleic monoestolide acid (m/z563.51, as [M-H]-), and oleic-oleic diestolide acid (m/z845.77 [M-H]-). The optimum loading of HClO4for every support are 15 wt.% HClO4/SiO2(SiO215), 10 wt.% HClO4/SG (SG10) and 35 wt.% HClO4/Al2O3(Al2O335). The SG10 turned out to be the best catalyst, achieving a final conversion of 97.5 % with 79.8 % selectivity to oleic-oleic monoestolide acid and 17.7 % selectivity to oleic-oleic diestolide acid. The activity and selectivity of the SG10 have been investigated and compared with homogeneous HClO4. The optimum catalysts for every support were characterized by XPS analysis, BET, TEM and TPD-NH3.

ChemInform Abstract: Sulfonamidoglycosylation of Methyl Glycosides Employing Perchloric Acid Supported on Silica Gel.

ChemInform ◽  
2009 ◽  
Vol 40 (3) ◽  
Author(s):  
Pedro A. Colinas ◽  
Nicolas A. Nunez ◽  
Rodolfo D. Bravo
Keyword(s):  
Silica Gel ◽  
Perchloric Acid
Sign in / Sign up

Export Citation Format

Share Document